⑥ mud containing CMC, good stability, even at temperatures above 150 ℃ can still reduce water loss.

CMC with high viscosity and high degree of substitution is suitable for less dense mud. CMC with low viscosity and high degree of substitution is suitable for dense mud. Selection of CMC should be based on mud types and regions, well depth and other conditions to decide.

Conforms to API 13A Standard

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